JP2855131B2 - X-ray equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an intensifying screen attached to at least one of a pair of support members, and an X-ray film interposed between support members arranged opposite to an imaging stage. X to perform X-ray photography
The present invention relates to a radiographic apparatus.

[Prior Art] A mechanism has been conventionally proposed in which a rear support member is mechanically pressed against a front support member having good X-ray transmittance, thereby bringing an X-ray film and an intensifying screen into close contact with each other. In such a method, it is difficult to obtain good adhesion because the supporting member is deformed by the pressing force, and therefore, it is necessary to devise the shape of the supporting member and adjust the pressing force in each part. Further, the front support member needs to have high rigidity and good X-ray transparency, and it is necessary to use an expensive and difficult-to-work material such as a CFRP plate. Therefore, the front or rear intensifying screen is made of a stretchable member such as rubber, and this is further attached to a frame-shaped rigid support, and the front intensifying screen,
The part surrounded by the rear intensifying screen is sealed with packing or other means, and further connected to a vacuum pump or the like to reduce the pressure.The elastic support is pushed to atmospheric pressure, and the support A method of making close contact by being pressed is considered,
For example, it is disclosed in Japanese Utility Model Publication No. 53-16291.

However, in this method, since the film is placed horizontally, the film is not shifted from the predetermined position between the time when the film is fed to the predetermined position by the roller and the time when the lid is returned to the predetermined position. When held up and down by gravity, the roller separates and the lid is returned,
There is a problem that the film falls downward due to gravity before the pressure is reduced.

Further, in the vacuum evaporation method, when taking a film while holding the film in a position other than horizontal, a notch is required as in, for example, Japanese Utility Model Publication No. 60-4178, for taking in and out of the film or holding the film. However, such a notch causes a problem that air leakage is large when the pressure is reduced, and the pressure reducing means such as a pump becomes large in order to obtain a desired close contact.

[Problems to be Solved by the Invention] It is an object of the present invention to solve the above-mentioned problems and to provide an X-ray imaging apparatus capable of reliably holding a film under reduced pressure.

[Means for Solving the Problems] In order to achieve the above object, an X-ray imaging apparatus according to a first aspect of the present invention attaches an intensifying screen to at least one of a pair of support members, and captures images facing each other. An X-ray film is fed between supporting members arranged on a stage, and after performing X-ray photography with the intensifying screen and the X-ray film sandwiched between the supporting members, the X-ray film is retreated from the imaging stage. In the X-ray imaging apparatus, feeding means for feeding the X-ray film between the support members, sealing means for hermetically sealing a part including the whole of the X-ray film and the intensifying screen, and the sealing means A suction means provided in a space sealed by the vacuum means for holding the X-ray film at a predetermined position between the support members by vacuum suction, and a first pressure reducing means for reducing the pressure of the suction means via an exhaust hole; The sea Second decompression means for decompressing the filtered portion through an exhaust hole different from the first decompression means, and retreat means for retreating the X-ray film from between the support members. Before decompression of the sealed portion by the decompression means,
The decompression adsorption of the adsorption means is executed by the decompression means.

Further, the X-ray imaging apparatus according to the second aspect of the present invention is configured such that an intensifying screen is attached to at least one of the pair of support members, and the X-ray film is fed between the support members arranged on the imaging stage facing each other. In an X-ray imaging apparatus for removing the X-ray film from the imaging stage after performing X-ray imaging with the intensifying screen and the X-ray film interposed between supporting members, the X-ray film is interposed between the supporting members. Feeding means for feeding, sealing means for hermetically sealing a portion including the whole of the X-ray film and the intensifying screen, and at least the X-ray film provided in a space sealed by the sealing means. An adsorbing means for adsorbing and holding the X-ray film at a predetermined position between the support members at a stage before being brought into close contact with the paper-sensitive paper, and a first decompressing means for depressurizing the adsorbing means through an exhaust hole When Wherein the sealing portion first
A second pressure reducing means for reducing the pressure through an exhaust hole different from the pressure reducing means, and a retreating means for retreating the X-ray film from between the support members.

[Operation] In the X-ray imaging apparatus having the above-described configuration, the support means for supporting the X-ray film at a predetermined position is provided in the decompressed portion, so that the film can be reliably held between the support members regardless of the direction in which the film is held. The film is inserted, the film is brought into close contact with the intensifying screen by depressurization, and the depressurization is released, and the film is retreated from between the support members.

[Example] The present invention will be described in detail based on an illustrated example.

1 to 5 show a first embodiment, and FIG. 1 is a perspective view, in which a front support member 1 is made of a material having good X-ray transparency, a front intensifying screen 2, and a rear side. The support member 3 is made of a material having elasticity and elasticity such as rubber. The rear support member 3 is attached to a frame 4 having more rigidity by bonding or the like, and the rear intensifying screen 5 is attached to the rear support member 3 by bonding or the like. FIG. 2 is a front view as viewed from the direction A in FIG. 1, in which the front support member 1 and the front intensifying screen 2 have been removed. FIG. 3 is a rear view as viewed from the direction B in FIG. 1, FIGS. 4 (a) and 4 (b) are side views, and FIGS. 5 (a) to 5 (d) are operation explanatory diagrams. A packing 6 having airtightness and flexibility is attached to the frame 4 directly or via the rear support member 3 by means such as adhesion. Also, the rear intensifying screen 5
Is movable to some extent back and forth by the elasticity of the rear support member 3. Overhangs 7 and 8 are provided on the left and right inside the upper part of the frame body 4.
Are provided with recesses 9 and 10, and rollers 11 and
12 are rotatably mounted on shafts 13 and 14 fixed to the left and right horizontal directions, and the rollers 11 and 12 are mounted on the frame 4 as shown in FIG.
It is slightly protruding from the front surface. In addition, annular adsorbing members 15 and 16 made of a flexible material such as rubber are attached to the overhang portions 7 and 8 by means such as adhesion.
16 has a surface height slightly lower than the protrusion height of the rollers 11 and 12 when viewed from the side. And rollers 11, 12,
The suction members 15 and 16 are located in openings 22 and 23 provided in the rear support member 3. Then, as can be seen from the figure, the suction members 15 and 16 are provided separately from the rear intensifying screen 5 in the space sealed by the packing 6. Exhaust holes 17, 18 are provided at the center of the suction members 15, 16, and these exhaust holes 17, 18 are also opened through the overhang portions 7, 8. Are provided with projections 19 and 20 having holes communicating with the exhaust holes 17 and 18. An air hose 21 is connected to these projections 19 and 20, and a pressure reducing means (not shown) is connected. At the lower part of the frame 4, the rear support member 3
And an exhaust hole 24 is provided through the frame 4.
A projection 25 having a hole communicating with 24 is attached, and an air hose 26 is connected to the projection 25 and connected to a pressure reducing means (not shown). The depressurizing means and the aforementioned depressurizing means may be the same or separate, but in the same case, it is possible to switch between depressurizing both by a valve or the like and depressurizing only the air hose 21. Further, the front support member 1
Is fixed to a frame (not shown), and the frame body 4 is held by the frame so as to be able to move back and forth and swing freely, and is moved and swinged in the direction of arrow C in FIG. Above the front support member 1, a roller 27 is rotatably supported by a frame, and a lever 28 is rotatably mounted on a fixed shaft 29. A lever 30 is rotatable with respect to this lever 28 via a shaft 31. The roller 32 is attached to the tip of the lever 30
It is rotatably mounted via 33. As the lever 28 rotates, the roller 32 can be moved between a position shown in FIG. 5A and a position shown in FIG. 5B via guide means (not shown). When the roller 32 is at the position shown in FIG.
The lever 2 always stays in the position (b) and while moving.
It is urged by arrows 8 and 30 in the direction of arrow D in FIGS. 5 (a) and 5 (b). In addition, the driving means (not shown)
Numeral 32 is driven irrespective of FIGS. 5A and 5B or during movement. The levers 28, 30 are provided on both left and right sides, and the rollers 27, 32 may be provided separately on both left and right sides, or may be provided over the entire length in the width direction of the film. A movable guide plate 34 is provided below the roller 32.
The guide plate 34 can be moved to a position indicated by a solid line and a position indicated by a two-dot chain line in FIG.

Next, the operation will be described with reference to FIGS. 4 (a) and 5 (a).
By driving the rollers 27 and 32 in this state, the film F is fed from above and inserted between the intensifying screens 2 and 5. Immediately before the rear end of the film F separates from the rollers 27 and 32, the rollers 32
When the lever 28 is rotated clockwise so that the speed of the film F is substantially the same as the moving speed of the film F, the roller 32
Rolls almost without slipping on the surface. And roller
When the position 32 reaches the position shown in FIG. 5 (b), the lever 28 is rotated counterclockwise to stop at a position substantially coincident with the upper end of the film F. Next, when the air hose 21 is sucked, the film F is sucked by the suction members 15 and 16. Where lever 28
Is rotated in the counterclockwise direction, and the roller 32 is driven to rotate counterclockwise so that the peripheral speed of the roller 32 becomes the same as the moving speed of the roller 32. As a result, the roller 32 rolls and rises without sliding on the film F and the guide plate 34. When the roller 32 returns to the initial position, the rotation of the lever 28 and the rotation of the roller 32 are stopped.

Next, the guide plate 34 moves up to the position shown by the two-dot chain line in FIG. 4 (a), and the frame 4 further advances and rotates, as shown in FIGS. 4 (b) and 5 (c). Then, the space between the front support member 1 and the frame 4 is closed. During this time, the film F is sucked and held by the suction members 15 and 16. In the state of FIGS. 4B and 5C, the rear intensifying screen 5 and the front intensifying screen 2 do not adhere to each other, and a slight gap d is provided. A space e surrounded by the front support member 1, the rear support member 3, the frame 4, and the packing 6 is airtight. Here, when the inside is sucked from the exhaust hole 24, the pressure in the space e is reduced. At this time, the rear support member 3 can be moved back and forth at the opening of the frame 4, so that the rear support member 3 is pushed by the atmospheric pressure to increase the rear side. The screen 5 is moved forward, and the front screen 2, the film F and the rear screen 5 are brought into close contact with each other as shown in FIG. 5 (d). Assuming that the internal pressure of the space e is, for example, 0.2 atm lower than the atmospheric pressure, the space e is pressed with a force of 0.2 kgf / cm ² . At this time, suction by the air hose 21 does not have to be performed, and X-ray imaging is performed in this state.

When the X-ray imaging is completed, if the air hose 21 has stopped the suction, the suction is started, and then the suction by the air hose 26 is stopped to release to the atmospheric pressure. Then, a gap is generated again between the intensifying screens 2 and 5 due to the restoring force of the rear support member 3. Here, the frame 4 rotates counterclockwise while retreating,
It returns to the state of FIG. 5A and FIG. 5B. Next, the guide plate 34 moves to the position shown by the solid line in FIG. 4 (a), and the roller 32 moves to the position shown in FIG. 5 (b).
The film 32 is driven so as to roll without slipping, and when the action of the suction members 15 and 16 is released by the air hose 21, the film F separates from the suction members 15 and 16. Next, the roller 32 is rotated clockwise, and stops when the leading end of the film F reaches a little higher than the roller 27. Then, while rolling without rolling the roller 32, the same as in FIG. Then, the rotation of the lever 28 is stopped and the roller 32 is rotated clockwise to feed the film F from between the intensifying screens 2 and 5.

In the description of the embodiment, the packing 6 is fixed to the frame 4 side, but may be fixed to the front support member 1 side. Further, the roller 32 is a driving roller, but may be a free roller, and the roller 27 and the rollers 11 and 12 may be driving rollers. In order to use the rollers 11 and 12 as driving rollers, a small motor is provided in the frame body 4 so as not to impair the airtightness, or a lid that can be freely opened and closed is provided. When the rollers 11 and 12 are driven so as to maintain the airtightness, the lid may be opened and a drive transmitting unit may be inserted from here to transmit the driving force to the rollers 11 and 12.

6 (a) and 6 (b) show another embodiment, in which a roller 32 is used.
When the film F is taken in and out without providing the roller 27 as a position-immobilized driving roller, the frame 4 and the entire part attached thereto rise as shown in FIG.
The rollers 11 and 12 and the rear support member 2 are urged to reach a position where they are pressed against each other. The film F is used as the suction members 15 and 16
When the frame 4 is sucked, the frame 4 may move down to the position (b), and then the frame 4 may move forward, rotate, and adhere as in the previous embodiment.

FIG. 7 shows still another embodiment, in which a frame 40 is provided with a groove 40, and a lever 41 rotatably mounted on a shaft 41.
The lever 42 is accommodated in the groove 40, and a protrusion 43 is provided at the tip of the lever 42. The lever 42 is urged in the direction of the frame 4 by urging means (not shown). Elastic rubber is stretched on the back side of the groove 40, and the groove
40 is kept airtight. Further, the protrusion 44 is disposed so as to advance and retreat relatively to the frame body 4,
During forward movement, the lever 42 is pushed up via rubber, and FIG. 7 (a) shows a state where the lever 42 is pushed up.

In this embodiment, the film F is pressed and held by the lever 42 instead of holding the film F by suction with the suction members 15 and 16. That is, when the film F is sent to the home position in FIG. 5B, the projection 44 initially located at the position of FIG. 7B is retracted, and the lever 42 presses down the film F. Next, the roller 32 is raised, and the frame body 4 advances to bring the film F into close contact with each other and perform photographing. Then, with the contact released, the frame 4 retracted and the roller 32 lowered, the protrusion 44
Moves forward and pushes up the lever 42, where the roller 32 rotates clockwise to move the film F upward. When the film F slightly passes over the roller 27, it stops, the roller 32 rises and rotates clockwise again, and the film F is sent out from the photographing stage.

[Effects of the Invention] As described above, in the X-ray imaging apparatus according to the present invention, since the frame is completely sealed, desired adhesion to the film can be obtained even if the capacity of the decompression means such as a pump is small. . In particular, the film holding member is in the sealed space,
Since the film is provided separately from the intensifying screen or to hold the film before the intimate holding by the intensifying screen is performed, the sealing property of the sealing space is not impaired and the sealing space is increased after sealing. The film before being held in close contact with the paper can be stably held at the fixed position.

[Brief description of the drawings]

The drawings show an embodiment of an X-ray imaging apparatus according to the present invention.
FIG. 2 is a perspective view of the first embodiment, FIG. 2 is a front view as viewed from a direction A in FIG. 1, FIG. 3 is a rear view as viewed from a direction B in FIG. 1, FIG. FIGS. 5 (a) to 5 (d) are explanatory diagrams of the operation, FIGS. 6 (a) and 6 (b) are configuration diagrams of the second embodiment, and FIG. 7 is a configuration diagram of the third embodiment. 1 is a front support member, 2 is a front intensifying screen, 3 is a rear support member, 4 is a frame, 5 is a rear intensifying screen, 6 is a packing, 15,
16 is a suction member, 17, 18, 24 are exhaust holes, 21, 26 are air hoses, 28, 30, 42 are levers, 11, 12, 27, 32 are rollers, 34
Is a guide plate.

Claims (3)

(57) [Claims] 1. An intensifying screen is attached to at least one of a pair of supporting members, an X-ray film is fed between supporting members arranged on an imaging stage facing each other, and the intensifying screen is provided between the supporting members. And an X-ray apparatus for removing the X-ray film from the imaging stage after performing X-ray imaging with the X-ray film sandwiched between the X-ray film and the X-ray film. A sealing means for hermetically sealing a portion including the whole of the film and the intensifying screen, and provided in a space sealed by the sealing means to adsorb the X-ray film at a predetermined position between the support members under reduced pressure. And a first decompression means for depressurizing the adsorption means through an exhaust hole, and a first decompression means for depressurizing the sealed portion through an exhaust hole different from the first decompression means. 2 decompression hands And evacuation means for evacuation of the X-ray film from between the support members, wherein the pressure reduction of the suction means is performed by the first pressure reduction means before the pressure reduction of the sealed portion by the second pressure reduction means. An X-ray imaging apparatus characterized by performing suction. 2. An intensifying screen is attached to at least one of a pair of supporting members, and an X-ray film is fed between supporting members disposed on an imaging stage facing each other, and said intensifying screen is provided between said supporting members. And an X-ray apparatus for removing the X-ray film from the imaging stage after performing X-ray imaging with the X-ray film sandwiched between the X-ray film and the X-ray film. Sealing means for hermetically sealing a portion including the whole of the film and the intensifying screen, and provided in a space sealed by the sealing means before the X-ray film is at least adhered to the intensifying screen. Adsorbing means for adsorbing and holding the X-ray film at a predetermined position between the supporting members in a step, a first depressurizing means for depressurizing the adsorbing means through an exhaust hole, and the sealed portion. X-ray imaging, comprising: a second depressurizing means for depressurizing through an exhaust hole different from the first depressurizing means; and a retreating means for retreating the X-ray film from between the support members. apparatus. 3. An X-ray imaging apparatus according to claim 1, wherein the first and second pressure reducing means are the same.